Analyzer for analyzing moisture in ground conductance

Abstract

The invention relates to a ground condcutive water cut analyzer for measuring water cut in oilfield export liquor. It is characterized by that the described analyzer includes an electric conductance sensor, excitation source generation circuit, voltage differential signal detection and voltage / frequency signal covnersion circuit. The described electric conductance sensor is formed from insulating tube, ring excitation, electrode mounted on the inner wall of insulating tube and ring measurnig electrode. Under the action of excitationsource generation circuit the excitation electrode can provide alternating current with constant magneitude, and under the action of voltage / frequency converter the pressure-different signal inputted by measuring electrode can be converted into frequency signal and outputted, then passed through power amplifier and transferred into secondary meter. Its measurement accuracy is high, repeatability and good consistency.

Description

Technical field: [0001] The invention relates to a primary meter used in the field of oilfield metering, in particular to a conductivity-type water content analyzer used for measuring the water content in crude oil transfusion liquid at each transfer station of an oil production plant. Background technique: [0002] Water cut measurement is a key link in oilfield surface measurement. In the high water cut stage of oilfield development, there is an urgent need for metering devices that can accurately and reliably measure water cut. Currently used water content measurement instruments for oil-water two-phase flow include capacitive water-cut analyzers, vibrating tube densitometers and radioactive densitometers. The capacitive water-cut analyzer is suitable for the case where the oil is a continuous phase, and its accuracy is low when the water content is high, so it is rarely used at present; the radioactive density meter has reliable performance, but is expensive and has pot...

AI Technical Summary

Problems solved by technology

The capacitive water-cut analyzer is suitable for the case where the oil is a continuous phase, and its accuracy is low when the water content is high, so it is rarely used at present; the radioactive density meter has reliable performance, but is expensive and has potential safety hazards; the vibration tube density meter has relatively low measurement accuracy. High, but it is easily affected by factors such as scaling, and the gas in the fluid also causes large errors in measurement. Therefore, so far, there is no measuring instrument that can measure water content accurately and reliably in a safe and environmentally friendly manner.

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